Journal
MATERIALS LETTERS
Volume 223, Issue -, Pages 142-145Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2018.04.026
Keywords
Sensors; Semiconductors; Template-free; Volatile organic compounds; Zinc oxide
Funding
- Sao Paulo Research Foundation - FAPESP [2017/01267-1, 2016/22219-2, 2016/25267-8, 2016/04371-1, 2013/23886-4]
- National Council for Scientific and Technological Development - CNPq [444926/2014-3]
- LMA/IQ/Unesp and LNNano/CNPEM [21594]
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Sensors based on metal oxide semiconductors have been widely applied for the detection of several volatile organic compounds (VOCs). However, the development of sensing materials with high selectivity, improved sensitivity, low detection limit is still a challenge. In this work, bicone-like ZnO structure was synthesized by a rapid template-free microwave-assisted hydrothermal method and then applied as VOC sensor. The VOC-sensing tests revealed that ZnO structure presented a higher response toward butanone than to other VOCs, such as benzene, toluene, m-xylene, acetone, ethanol, acetaldehyde, and isopropanol. Moreover, the ZnO-based sensor showed an enhanced butanone-sensing performance at 400 degrees C, including a response of 29.4-100 ppm of butanone, high sensitivity to detect low butanone concentration (2 ppm), and a low detection limit of 0.41 ppm. Therefore, the unique bicone-like ZnO structure might be a promising candidate for butanone sensors. (C) 2018 Elsevier B.V. All rights reserved.
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